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Air-Mass and Frontal Extreme Precipitation Occurrence in Synoptic Situations

  • Ewa Łupikasza
Chapter
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Part of the Springer Atmospheric Sciences book series (SPRINGERATMO)

Abstract

The frequency of origin-based types of extreme precipitation in Europe displays a regionally varied relationship with the direction of the advection and the type of the pressure system. This chapter discusses relationships between origin-based types of precipitation and mesoscale circulation. For the purpose of this chapter, circulation types were identified for each grid point between 30°N and 80°N and 30°W and 70°E at the interval of 2.5° of latitude and longitude. The direction of air advection was identified with the geostrophic wind direction. The type of the pressure system was identified using the vorticity formula. The study also identified the conditional probability of the occurrence of each origin-based type of extreme precipitation in each of these circulation types.

All origin-based types of extreme precipitation occur in both cyclonic and anticyclonic situations, but the occurrence frequency of the former is higher. Dependencies between the occurrence of frontal precipitation and atmospheric circulation are characterised by a greater degree of regional variability than these between air-mass precipitation and atmospheric circulation. Extreme air-mass precipitation has the strongest association with the circulation in Southern Europe, in mountainous areas, on the southeastern North Sea coast, and on the western slopes of the Scandinavian Mountains. Extreme precipitation of the frontal type tends to be linked with both the direction of air advection and the type of the pressure system. In cyclones these relationships display strong seasonality, whereas in anticyclones they remain stable throughout the year. The breakdown of frontal precipitation into the types of associated fronts helps better define the relationship between its occurrence and atmospheric circulation, especially in cyclonic synoptic situations.

Keywords

Circulation types Precipitation probability Cyclone Anticyclone Synoptic situation 

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Ewa Łupikasza
    • 1
  1. 1.Faculty of Earth SciencesUniversity of SilesiaSosnowiecPoland

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